Apakah kepentingan kaedah Optional.or() dalam Java 9?

public Optional or(Supplier> supplier)

import java.util.Optional; import java.util.function.Supplier; public class OptionalOrTest { public static void main(String args[]) { Optional optional = Optional.of("TutorialsPoint"); Supplier> supplierString = () -> Optional.of("Not Present"); optional = optional.or(supplierString); optional.ifPresent(x -> System.out.println("Value: " + x)); optional = Optional.empty(); optional = optional.or(supplierString); optional.ifPresent(x -> System.out.println("Value: " + x)); } }

Value: TutorialsPoint Value: Not Present